Feature/time based search#32
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- IConfiguration: add optional TimeBudget property (default null) - ISearchManager/SearchManager: add IsAborted flag, StartTimedSearch(), CheckTimeBudget() with batched Stopwatch check every 1024 nodes - AlphaBetaPruning: abort check at top of SearchRecursively, guard TT writes when aborted to prevent cache poisoning - AlphaBetaSolver: add timeBudgetMs parameter (default 0), abort handling in iterative deepening loop and BestNodeSearch, discard aborted iteration results - SolverProvider: pass TimeBudget to solver - ConnectFour Configuration: MaxDepth=43, TimeBudget=5s
MaxSearchDepth was 16 but MaxDepth=43 allows searches up to depth 42, causing orderedStepBuffers[depth] to go out of bounds at depth 16+.
Terminal values used remaining depth (sbyte.MaxValue + depth), which varied with DepthLimit — the same forced win scored higher at deeper iterations, causing +2 value drift per iteration and suboptimal MTD(f) guess propagation. Now uses distanceFromRoot: WinValue = sbyte.MaxValue + MaxSearchDepth - distanceFromRoot, making the same game outcome produce identical values regardless of search depth. Updated BestNodeSearch bounds to match new WinValue range (±175).
…nto SearchManager
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